[...] I’m pleased to announce that Android Market is now accepting priced applications from US and UK developers. Developers from these countries can go to the publisher website at http://market.android.com/publish to upload their application(s) along with end user pricing for the apps. Initially, priced applications will be available to end users in the US starting mid next week. We will add end user support for additional countries in the coming months. [...] Source.
What does this mean for you? Presumably we’ll be getting some high quality apps from developers that aren’t keen on giving anything away. I expect we’ll see many of the apps on 3rd-party stores (like SlideME, AndAppStore, Android Guys, Handango, etc.) will make appearances on the Android Market now. To compete with Google, those other stores are going to have to increase the incentive for developers perhaps through lower fees (however, Google’s rates are not outragous) or by utilizing other forms of payment from users, since the Android Market will only use Google Checkout for processing transactions.
Get ready for more apps, and to pay for them.